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The stabbing happened in the school's quad at 8:30 a.m., while it was full of students, and minutes before classes were scheduled to begin.

After stabbing the boy with a kitchen knife, the attacker threatened to stab other classmates if they came near him, Banuelos said. Some students recorded the scary incident with their cellphones and posted videos on SnapChat.

KSBW / SnapChat

Student with knife

One SnapChat video shows a boy wearing a white hoodie sweatshirt pointing a knife at woman who appears to be a school administrator. The victim appears to be slumped over on the ground.

Nearby students run away from the knife-brandishing boy. The woman appears to be remarkably calm while a knife is pointed directly at her, and her hand gestures suggest she is trying to convince the boy to put the knife down.

One school staff member tackled the boy and he was taken into custody. The school went on lockdown.

The victim was flown to a Bay Area trauma center. Banuelos said the boy's stab wounds are life threatening. As of 2:30 p.m. Monday, the boy's condition had been upgraded to stable, according to the district superintendent.

Investigators said the motive behind Monday's school violence remains unclear.

Late Monday afternoon, a man who claimed to be the father of the arrested student called KSBW and said, "I understand what he did was wrong." He said he feared for his son's safety in Juvenile Hall because of the SnapChat videos and media coverage. "Stuff happens in Juvenile Hall," he added.

KSBW

Parents waiting to pick up their kids

The boy is facing attempted murder charges. His name was not released.

More than 100 parents went to the school to take their children home. By 11:30 a.m., parents began voicing frustrations that the reunification process was taking too long. Some parents had to wait more than three hours.

"It's ridiculous. To me it's like a jail that our kids are getting out of," parents Dennis Keldsen said. "They won't let us go see our kids. I've been here for two hours and I finally got to see my son."

With the accused attacker in custody, deputies said they do not think any more students are in danger.